Case Study 11

library(tidyverse)
library(spData)
library(sf)
library(mapview)

## Warning: package 'mapview' was built under R version 4.2.2

library(foreach)

## Warning: package 'foreach' was built under R version 4.2.2

library(doParallel)

## Warning: package 'doParallel' was built under R version 4.2.2

## Warning: package 'iterators' was built under R version 4.2.2

registerDoParallel(4)
getDoParWorkers()

## [1] 4

library(tidycensus)

## Warning: package 'tidycensus' was built under R version 4.2.2

census_api_key("14e390f2c960887e1a905d2d6d768190f715a3d5")

library(tidycensus)
racevars <- c(White = "P005003", 
              Black = "P005004", 
              Asian = "P005006", 
              Hispanic = "P004003")

options(tigris_use_cache = TRUE)
erie <- get_decennial(geography = "block", variables = racevars, 
                  state = "NY", county = "Erie County", geometry = TRUE,
                  summary_var = "P001001", cache_table=T) 
cropped_data <- st_crop (erie, xmin=-78.9,xmax=-78.85,ymin=42.888,ymax=42.92)                  

## Warning: attribute variables are assumed to be spatially constant throughout all
## geometries

race = unique(cropped_data$variable)

foreach(race, i=1:4, .combine = "rbind") %do%
  race[i]

##          [,1]      
## result.1 "White"   
## result.2 "Black"   
## result.3 "Asian"   
## result.4 "Hispanic"

buffalo_race <- foreach(i=1:4, .combine = "rbind") %do% {
  cropped_data %>% 
    filter(variable == race[i]) %>% 
    st_sample(size = .$value) %>% 
    st_as_sf() %>% 
    mutate(variable = race[i])
}

mapview(buffalo_race, 
        cex = 1, 
        alpha = 0)